Hofner Violin Bass A guitar pickup is essentially similar to an energetic microphone coil. For many years, active microphones have now been wired with the voice coil attached with the principal of the microphone's transformer, and perhaps not introduced to soil (‘floating'). The microphone's case is typically linked to the wire guard, which can be linked to the microphone amplifier's soil (see Rane's site for more discussion).
By and big, vibrant microphones are very calm products as a result of the combination of transformer solitude and balanced, flying sign lines all through, along with shielded, humbucking coils.
So why don't you guitars? Guitars are once plagued by noise. Humbucking pickups are merely an incomplete (though essential!) solution. The obvious alternative is to move the guitar collection to a healthy production, being a microphone. A similar idea was printed this 2001 patent request such as Hofner Violin Bass?